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Prince Harry put the crown jewels on display in Vegas this weekend ... getting BARE ASS NAKED during a game of strip billiards with a room full of friends in his VIP suite. It all went down Friday night during a raging party at the MGM Grand.

We're told Harry, along with a large entourage, went down to the hotel bar and met a bunch of hot chicks ... and invited them up to his VIP suite.

Once in the room, things got WILD ... with the group playing a game of strip pool that quickly escalated into full-on royal nudity.

Some of the partiers snapped photos of the madness. In one photo, a fully nude Harry cups his genitals while a seemingly topless woman stands behind him.

In another photo, a naked Harry is bear-hugging a woman who appears to be completely naked as well.